メタデータ
| 項目 |
値 |
| Designation |
P/2009 Q5 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-09-08T13:50:29.091840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:34Z |
| Obs used |
331 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-10-09.0000000 |
| e |
0.60905285 |
| q (au) |
2.918512 |
| a (au) |
7.465233 |
| i (deg) |
40.904822 |
| Ω (om, deg) |
160.139864 |
| ω (w, deg) |
209.274918 |
| M (ma, deg) |
1.470093 |
等級
散乱 + 全体線形
$$
M_a = (12.634 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.634 |
| n |
2.000 |
| gf |
0.974 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.888 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
15:52:09.57 |
+25:15:34.2 |
HIP 77676 |
9.48 |
| 2026-06-01 12:00 |
15:51:57.33 |
+25:15:41.9 |
HIP 77676 |
6.82 |
| 2026-06-02 00:00 |
15:51:45.12 |
+25:15:48.0 |
HIP 77676 |
4.33 |
| 2026-06-02 12:00 |
15:51:32.93 |
+25:15:52.6 |
HIP 77676 |
2.51 |
| 2026-06-03 00:00 |
15:51:20.78 |
+25:15:55.6 |
HIP 77676 |
3.02 |
| 2026-06-03 12:00 |
15:51:08.66 |
+25:15:57.2 |
HIP 77676 |
5.21 |
| 2026-06-04 00:00 |
15:50:56.57 |
+25:15:57.2 |
HIP 77676 |
7.76 |
| 2026-06-04 12:00 |
15:50:44.51 |
+25:15:55.7 |
HIP 77676 |
10.40 |
| 2026-06-05 00:00 |
15:50:32.50 |
+25:15:52.7 |
HIP 77676 |
13.07 |
| 2026-06-05 12:00 |
15:50:20.52 |
+25:15:48.1 |
HIP 77676 |
15.75 |
| 2026-06-06 00:00 |
15:50:08.58 |
+25:15:42.0 |
HIP 77504 |
14.37 |
| 2026-06-06 12:00 |
15:49:56.68 |
+25:15:34.4 |
HIP 77504 |
13.18 |
| 2026-06-07 00:00 |
15:49:44.82 |
+25:15:25.3 |
HIP 77504 |
12.48 |
| 2026-06-07 12:00 |
15:49:33.01 |
+25:15:14.7 |
HIP 77504 |
12.37 |
| 2026-06-08 00:00 |
15:49:21.24 |
+25:15:02.6 |
HIP 77504 |
12.84 |
| 2026-06-08 12:00 |
15:49:09.52 |
+25:14:48.9 |
HIP 77504 |
13.85 |
| 2026-06-09 00:00 |
15:48:57.84 |
+25:14:33.7 |
HIP 77504 |
15.27 |
| 2026-06-09 12:00 |
15:48:46.22 |
+25:14:17.1 |
HIP 77504 |
17.00 |
| 2026-06-10 00:00 |
15:48:34.65 |
+25:13:58.9 |
HIP 77504 |
18.96 |
| 2026-06-10 12:00 |
15:48:23.13 |
+25:13:39.2 |
HIP 77504 |
21.07 |
| 2026-06-11 00:00 |
15:48:11.66 |
+25:13:18.0 |
HIP 77291 |
20.18 |
| 2026-06-11 12:00 |
15:48:00.25 |
+25:12:55.3 |
HIP 77291 |
17.68 |
| 2026-06-12 00:00 |
15:47:48.90 |
+25:12:31.2 |
HIP 77291 |
15.21 |
| 2026-06-12 12:00 |
15:47:37.60 |
+25:12:05.5 |
HIP 77291 |
12.80 |
| 2026-06-13 00:00 |
15:47:26.37 |
+25:11:38.3 |
HIP 77291 |
10.47 |
| 2026-06-13 12:00 |
15:47:15.20 |
+25:11:09.7 |
HIP 77291 |
8.29 |
| 2026-06-14 00:00 |
15:47:04.09 |
+25:10:39.6 |
HIP 77291 |
6.38 |
| 2026-06-14 12:00 |
15:46:53.04 |
+25:10:08.0 |
HIP 77291 |
5.06 |
| 2026-06-15 00:00 |
15:46:42.06 |
+25:09:34.9 |
HIP 77291 |
4.83 |
| 2026-06-15 12:00 |
15:46:31.15 |
+25:09:00.4 |
HIP 77291 |
5.81 |
| 2026-06-16 00:00 |
15:46:20.31 |
+25:08:24.4 |
HIP 77291 |
7.52 |
| 2026-06-16 12:00 |
15:46:09.54 |
+25:07:47.0 |
HIP 77291 |
9.58 |
| 2026-06-17 00:00 |
15:45:58.84 |
+25:07:08.1 |
HIP 77291 |
11.80 |
| 2026-06-17 12:00 |
15:45:48.21 |
+25:06:27.8 |
HIP 77291 |
14.09 |
| 2026-06-18 00:00 |
15:45:37.65 |
+25:05:46.0 |
HIP 77291 |
16.43 |
| 2026-06-18 12:00 |
15:45:27.18 |
+25:05:02.8 |
HIP 77291 |
18.79 |
| 2026-06-19 00:00 |
15:45:16.78 |
+25:04:18.2 |
HIP 77040 |
19.95 |
| 2026-06-19 12:00 |
15:45:06.45 |
+25:03:32.2 |
HIP 77040 |
17.49 |
| 2026-06-20 00:00 |
15:44:56.21 |
+25:02:44.8 |
HIP 77040 |
15.04 |
| 2026-06-20 12:00 |
15:44:46.05 |
+25:01:56.0 |
HIP 77040 |
12.60 |
| 2026-06-21 00:00 |
15:44:35.97 |
+25:01:05.8 |
HIP 77040 |
10.17 |
| 2026-06-21 12:00 |
15:44:25.97 |
+25:00:14.2 |
HIP 77040 |
7.75 |
| 2026-06-22 00:00 |
15:44:16.06 |
+24:59:21.3 |
HIP 77040 |
5.34 |